| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|
| 2 | #ifndef BOOT_IO_H |
|---|
| 3 | #define BOOT_IO_H |
|---|
| 4 | |
|---|
| 5 | #include <asm/shared/io.h> |
|---|
| 6 | |
|---|
| 7 | #undef inb |
|---|
| 8 | #undef inw |
|---|
| 9 | #undef inl |
|---|
| 10 | #undef outb |
|---|
| 11 | #undef outw |
|---|
| 12 | #undef outl |
|---|
| 13 | |
|---|
| 14 | struct port_io_ops { |
|---|
| 15 | u8 (*f_inb)(u16 port); |
|---|
| 16 | void (*f_outb)(u8 v, u16 port); |
|---|
| 17 | void (*f_outw)(u16 v, u16 port); |
|---|
| 18 | }; |
|---|
| 19 | |
|---|
| 20 | extern struct port_io_ops pio_ops; |
|---|
| 21 | |
|---|
| 22 | /* |
|---|
| 23 | * Use the normal I/O instructions by default. |
|---|
| 24 | * TDX guests override these to use hypercalls. |
|---|
| 25 | */ |
|---|
| 26 | static inline void init_default_io_ops(void) |
|---|
| 27 | { |
|---|
| 28 | pio_ops.f_inb = __inb; |
|---|
| 29 | pio_ops.f_outb = __outb; |
|---|
| 30 | pio_ops.f_outw = __outw; |
|---|
| 31 | } |
|---|
| 32 | |
|---|
| 33 | /* |
|---|
| 34 | * Redirect port I/O operations via pio_ops callbacks. |
|---|
| 35 | * TDX guests override these callbacks with TDX-specific helpers. |
|---|
| 36 | */ |
|---|
| 37 | #define inb pio_ops.f_inb |
|---|
| 38 | #define outb pio_ops.f_outb |
|---|
| 39 | #define outw pio_ops.f_outw |
|---|
| 40 | |
|---|
| 41 | #endif |
|---|
| 42 | |
|---|
